Out of Place (OOP) Patching of Oracle Restart 21c

Previous post showed OOP for 19c Oracle restart. Things are much simpler in 21c and can expect the same for 23c once released. The -switchGridHome option is supported for Oracle Restart in 21c (Oracle doc here). As such the OOP is simply installing new GI home in a different location with -switchGridHome option.
The current GI home is in /opt/codegen/app/oracle/product/21.x.0/grid and release patch is

crsctl query has releasepatch
Oracle Clusterware release patch level is [3414221900] and the complete list of patches [35132583 35134934 35134943 35149778 35222143 35226235 ] have been applied on the local node. The release patch string is [21.10.0.0.0].

Run the gridsetup with -switchGridHome option and any RU and one-off patches. This step doesn't result in downtime.

./gridSetup.sh -silent -switchGridHome  -applyRU /opt/installs/patches/35427907
Preparing the home to patch...
Applying the patch /opt/installs/patches/35427907...
Successfully applied the patch.
The log can be found at: /opt/codegen/app/oraInventory/logs/GridSetupActions2023-07-21_01-55-36PM/installerPatchActions_2023-07-21_01-55-36PM.log
Launching Oracle Grid Infrastructure Setup Wizard...

You can find the log of this install session at:
 /opt/codegen/app/oraInventory/logs/GridSetupActions2023-07-21_01-55-36PM/gridSetupActions2023-07-21_01-55-36PM.log

As a root user, execute the following script(s):
        1. /opt/codegen/app/oracle/product/21.11.0/grid/root.sh

Execute /opt/codegen/app/oracle/product/21.11.0/grid/root.sh on the following nodes:
[ip-172-31-10-193]

When prompted run the root.sh. This is where the grid home switching happens and results in down time. In the course of running root.sh the HAS stack is brought down in the old GI home and started in the new GI home.

/opt/codegen/app/oracle/product/21.11.0/grid/root.sh
Check /opt/codegen/app/oracle/product/21.11.0/grid/install/root_ip-172-31-10-193.eu-west-1.compute.internal_2023-07-21_14-06-15-742998108.log for the output of root script

The output on the log files shows prepatch and postpatch steps run on the new GI home.

Performing root user operation.

The following environment variables are set as:
    ORACLE_OWNER= oracle
    ORACLE_HOME=  /opt/codegen/app/oracle/product/21.11.0/grid
   Copying dbhome to /usr/local/bin ...
   Copying oraenv to /usr/local/bin ...
   Copying coraenv to /usr/local/bin ...

Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
Using configuration parameter file: /opt/codegen/app/oracle/product/21.11.0/grid/crs/install/crsconfig_params
The log of current session can be found at:
  /opt/codegen/app/oracle/crsdata/ip-172-31-10-193/crsconfig/hapatch_2023-07-21_02-06-16PM.log
2023/07/21 14:06:18 CLSRSC-347: Successfully unlock /opt/codegen/app/oracle/product/21.11.0/grid
2023/07/21 14:06:18 CLSRSC-671: Pre-patch steps for patching GI home successfully completed.
Using configuration parameter file: /opt/codegen/app/oracle/product/21.11.0/grid/crs/install/crsconfig_params
The log of current session can be found at:
  /opt/codegen/app/oracle/crsdata/ip-172-31-10-193/crsconfig/hapatch_2023-07-21_02-06-18PM.log
2023/07/21 14:07:16 CLSRSC-329: Replacing Clusterware entries in file 'oracle-ohasd.service'
2023/07/21 14:08:01 CLSRSC-672: Post-patch steps for patching GI home successfully completed.

Looking at the currently running processes will show the GI related processes running out of new GI home.

  32070 ?        Ssl    0:02 /opt/codegen/app/oracle/product/21.11.0/grid/bin/ohasd.bin reboot _ORA_BLOCKING_STACK_LOCALE=AMERICAN_AMERICA.AL32UTF8
  32281 ?        Ssl    0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/oraagent.bin
  32308 ?        Ssl    0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/evmd.bin
  32312 ?        Ss     0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/tnslsnr LISTENER -no_crs_notify -inherit
  32368 ?        Ssl    0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/evmlogger.bin -o /opt/codegen/app/oracle/product/21.11.0/grid/log/[HOSTNAME]/evmd/evmlogger.info -l /opt/codegen/app/oracle/product/21.11.0/grid/log/[HOSTNAME]
  32384 ?        Ssl    0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/cssdagent
  32423 ?        Ssl    0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/onmd.bin
  32425 ?        Ssl    0:00 /opt/codegen/app/oracle/product/21.11.0/grid/bin/ocssd.bin

Release patch is 21.11

 crsctl query has releasepatch
Oracle Clusterware release patch level is [1435465441] and the complete list of patches [35428978 35442014 35442022 35442029 35550598 35589155 ] have been applied on the local node. The release patch string is [21.11.0.0.0].

Unlike in 19c no manual work is needed for updating the oracle inventory. New GI home is auto added with crs=true and crs=true is removed from old home during the GI home switch processes.

<HOME NAME="OraGI21Home1" LOC="/opt/codegen/app/oracle/product/21.x.0/grid" TYPE="O" IDX="1"/>
<HOME NAME="OraGI21Home2" LOC="/opt/codegen/app/oracle/product/21.11.0/grid" TYPE="O" IDX="4" CRS="true"/>

Related Posts
Out of Place (OOP) Patching of Oracle Restart